Multiple master cylinder unit



Dec. 27, 1938. J. w. WHITE MULTIPLE MASTER CYLINDER UNIT Filed Nov. 25, 1935 2 Sh ee tS Sheet 1 7 INVENTOR QHN WILLIAyWHITE A TTORNEYS Dec. 27, 1938. I 2,141,498

MULTIPLE MASTER CYLINDER UNIT Filed Nov. 25, 1935 2 Shets-Sheet '2 IIII n FIG.5.'

' INVENTOR JOHN WILLIAM WHETE BY WM ATTORNEYS Patented Dec. 27, 1938 UNITED STATES PATENT GFFEE 1 Kelsey-Hayes Wheel Company, a corporation of Delaware Detroit, Mich.,

Application November 25, 1935, Serial No. 51,538

3 Claims.

In the present state of the art hydraulic transmissions have been used .for various purposes, such for instance as for actuating brakes of a vehicle or for transmitting pedal pressure to a clutch. In some cases a vehicle may be provided with both an hydraulic brake system and hydraulic clutch actuating means, but these as usually constructed are entirely independent of each other. It is the object of the present invention to obtain a construction of master cylinder for use in connection with a plurality of hydraulic transmissions capable of independent actuation. To this end the invention consists in the construction as hereinafter set forth.

In the drawings:

Figure 1 is a vertical longitudinal section through my improved master cylinder;

Figure 2 'is a cross-section on line 2-2 of Figure 1 Figure 3 is a plan View;

Figure 4 is an end elevation;

Figures 5 and 6 are diagrammatic elevations showing modified constructions.

It is the primary object of the invention to simplify and reduce the cost of dual or multiple hydraulic systems by providing a single unit forming the master cylinder therefor. This unit is, however, so constructed as to permit of independent actuation of the different hydraulic systems. As shown, A is a casing forming a reservoir for the hydraulic fluid and also a mounting for the actuating pedals B and C. These pedals are respectively mounted on shafts D and E which are arranged in axial alignment and engage bearings F and F on opposite sides of the casing A, and a common center bearing G which also is formed integral with said casing. Between thecenter bearing G and the outer bearings F and F are arranged rockarms H and I sleeved upon the shafts D and E and secured thereto by pins J and J. These pins are preferably tapered and to permit of engaging the same with the registering apparatus in the rockarms and the shafts D and E, the casing A is provided with apertures in the end wall thereof which are in alignment with said pins. These apertures are normally closed by screw threaded plugs K which, however, may be removed for engagement or disengagement of the pins.

The rockarms H and I extend downward in the casing A and are connected by rods L, L with pistons M, M for engaging cylinders N, N. These cylinders are preferably formed integral with a flanged head forming a closure for an opening in the end of the casing A, said (01. Gil-54.6)

head being detachably secured to the casing by bolts P. The cylinders N and N are preferably closed at their outer ends but are provided with outlet connections Q, Q preferably arranged on the lower side thereof. Removable plugs R, R. are arranged at the top opposite the connections Q, Q to permit of bleeding air from the system when it is being filled with an hydraulic fluid. The pistons M and rods L are preferably integral with each other, the pistons 10 being sufliciently rounded to permit the required angular movement during movement of the arms H and I. Sealing of the pistons is through cups S which have sufficient resiliency and flexibility to permit of this angular movement, while maintaining the seal.

The top of the casing is closed by a removable, cover plate T secured by bolts U, and a breather V is also attached to said cover. The casing A may be mounted by suitable means such as an 0 integral bracket W attached to any part of the engine or supporting frame.

In operation, the pedals B and C may be actuated independently of each other, each transmitting movement to its corresponding rockarm and from the latter through the connecting rod to the piston in the corresponding cylinder. However, both pedals have a common mounting and a single reservoir supplies fluid to both cylinders.

In the modified construction shown in Figure 5, the pedals B and C" are directly connected with the rockarms H and I being arranged be-' tween the central bearing G and the outer bearings F, F.

In the modified construction shown in Figure 6, the arrangement of pedals, rockarms, and rockshafts is the same as shown in Figures 1 and 2, but the bearings F F and G are mounted on a frame separate from the reservoir casing. 40

What I claim as my invention is:

1. In a multiple master cylinder unit, a casing forming a fluid reservoir, a plurality of cylinders within'said casing, pistons within said cylinders capable of a slight rocking movement therein while maintaining the seal, rods for actuating said pistons, axially aligned rockshafts, hearings on the upper end and upon opposite sides of said casing in which said shafts are respectively journaled, a center bearing bridging across said casing and engaging the adjacent ends of said shafts, rockarms sleeved on said shafts between said outer bearings and central bearings, pins for coupling said rockarms to said shafts insertable through aligned apertures in said casing and pivotal connections between the lower ends of said rockarms and said rods. V

2. In a multiple master cylinder unit, a casing forming a reservoir, a rockshaft journaled in bearings on said casing, a rockarm between said bearings sleeved upon said'rockshaft; a pin for coupling said rockarm to saidrockshaft insert able through an aperture in the sidewall of said casing, and a plug for closing said aperture.

3. A multiple master cylinder unit comprising a casing having an open top and an open end, bearings integral with opposite side walls of said casing adjacentto the upper end thereof, a central bearing integral with said casing axially aligned with said side bearings, a closure for the top of said casing, a head for closing the end of said casing having integral therewith a pair of parallelly arranged cylinders projecting into Wall of said casing,

said casing and open at their inner ends, said head being provided with connections to said 7 cylinders outside said. casing, pistons in said cylinders having integral rods and capable of a slight rocking movement while maintaining the seal, rookarms pivotally'connected to said rods and having apertured upper ends arranged between said central bearing and one of' the side bearings in axial alignment therewith; a pair of shafts insertable through the side bearings and aligned apertured rockarms into engagement with said central bearing, pedals for actuating said shafts, a pin for coupling each rockarm to its shaft insertable through an aperture in the aperture. 7 V JOHN WILLIAM WHITE.

and a plugfor closing said 15 

